#region Copyright (c) 2006-2013 nHydrate.org, All Rights Reserved
// -------------------------------------------------------------------------- *
//                           NHYDRATE.ORG                                     *
//              Copyright (c) 2006-2013 All Rights reserved                   *
//                                                                            *
//                                                                            *
// Permission is hereby granted, free of charge, to any person obtaining a    *
// copy of this software and associated documentation files (the "Software"), *
// to deal in the Software without restriction, including without limitation  *
// the rights to use, copy, modify, merge, publish, distribute, sublicense,   *
// and/or sell copies of the Software, and to permit persons to whom the      *
// Software is furnished to do so, subject to the following conditions:       *
//                                                                            *
// The above copyright notice and this permission notice shall be included    *
// in all copies or substantial portions of the Software.                     *
//                                                                            *
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,            *
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES            *
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  *
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY       *
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,       *
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE          *
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                     *
// -------------------------------------------------------------------------- *
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace nHydrate.Dsl.Design.Converters
{
	internal class TextDecimalScaleConverter : TypeConverter
	{
		public TextDecimalScaleConverter()
		{
		}

		public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
		{
			if (destinationType == typeof(string)) return true;
			return base.CanConvertTo(context, destinationType);
		}

		public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
		{
			try
			{
				if (destinationType == typeof(string))
				{
					var retval = string.Empty;
					if (context.Instance is nHydrate.Dsl.Field)
					{
						var column = context.Instance as nHydrate.Dsl.Field;
						if (column.DataType.GetPredefinedScale() != -1)
							retval = "undefined";
						else
							retval = column.Scale.ToString();
					}
					else if (context.Instance is nHydrate.Dsl.StoredProcedureField)
					{
						var column = context.Instance as nHydrate.Dsl.StoredProcedureField;
						if (column.DataType.GetPredefinedScale() != -1)
							retval = "undefined";
						else
							retval = column.Scale.ToString();
					}
					else if (context.Instance is nHydrate.Dsl.StoredProcedureParameter)
					{
						var column = context.Instance as nHydrate.Dsl.StoredProcedureParameter;
						if (column.DataType.GetPredefinedScale() != -1)
							retval = "undefined";
						else
							retval = column.Scale.ToString();
					}
					else if (context.Instance is nHydrate.Dsl.ViewField)
					{
						var column = context.Instance as nHydrate.Dsl.ViewField;
						if (column.DataType.GetPredefinedScale() != -1)
							retval = "undefined";
						else
							retval = column.Scale.ToString();
					}

					return retval;
				}
			}
			catch (Exception ex) { }
			return null;
		}

		public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
		{
			if (context.Instance is nHydrate.Dsl.Field)
			{
				var column = context.Instance as nHydrate.Dsl.Field;
				if (sourceType == typeof(string))
					return true;
				else if (sourceType == typeof(int))
					return true;
				else
					return false;
			}
			else if (context.Instance is nHydrate.Dsl.StoredProcedureField)
			{
				var column = context.Instance as nHydrate.Dsl.StoredProcedureField;
				if (sourceType == typeof(string))
					return true;
				else if (sourceType == typeof(int))
					return true;
				else
					return false;
			}
			else if (context.Instance is nHydrate.Dsl.StoredProcedureParameter)
			{
				var column = context.Instance as nHydrate.Dsl.StoredProcedureParameter;
				if (sourceType == typeof(string))
					return true;
				else if (sourceType == typeof(int))
					return true;
				else
					return false;
			}
			else if (context.Instance is nHydrate.Dsl.ViewField)
			{
				var column = context.Instance as nHydrate.Dsl.ViewField;
				if (sourceType == typeof(string))
					return true;
				else if (sourceType == typeof(int))
					return true;
				else
					return false;
			}
			return false;
		}

		public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
		{
			if (value is string)
			{
				int v;
				if (int.TryParse(value.ToString(), out v))
				{
					return v;
				}
			}
			return 0;
		}

	}
}

